From: Adam Kupczyk <akupczyk@ibm.com>
Date: Thu, 7 May 2026 11:52:50 +0000 (+0000)
Subject: os/bluestore: No more stray spanning blobs creation
X-Git-Tag: v21.0.1~24^2~1
X-Git-Url: http://git-server-git.apps.pok.os.sepia.ceph.com/?a=commitdiff_plain;h=e4804d2cacac6a4979ef00b1ccc181cc61fee193;p=ceph.git

os/bluestore: No more stray spanning blobs creation

Prevent ExtentMap::reshard_action() from creating stray spanning blobs.
Fixes: https://tracker.ceph.com/issues/75698

Signed-off-by: Adam Kupczyk <akupczyk@ibm.com>
---

diff --git a/src/os/bluestore/BlueStore.cc b/src/os/bluestore/BlueStore.cc
index 6c47ce2b558..9a93f65f0b4 100644
--- a/src/os/bluestore/BlueStore.cc
+++ b/src/os/bluestore/BlueStore.cc
@@ -3913,6 +3913,11 @@ void BlueStore::ExtentMap::reshard_action(
 			   << std::hex << bstart1 << " blob_offset 0x"
 			   << blob_offset << std::dec << " " << *b << dendl;
 		  b = split_blob(b, blob_offset, sh.shard_info->offset);
+                  if (b->get_blob().get_ondisk_size() == 0) {
+                    // The blob b is empty; there are no extents that can reference it.
+                    // It will be deleted as soon as it gets out of scope.
+                    break;
+                  }
 		  // switch b to the new right-hand side, in case it
 		  // *also* has to get split.
 		  bstart1 = sh.shard_info->offset;